Java SE (Java Platform, Standard Edition)

HI all,
I've been fiddling with making my app more configurable, more pretty and started changing the UI.

That in itself, I don't have a problem with. The java demos illustrated that fine. The problem is that I don't have a reference to everything that needs to be updated, specifically a JFileChooser. Whilst searching I saw others use Frame.getFrames(), but JFileChooser doesn't extend Frame, so no good.
Here's a test rig:

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class UpdateUITest extends JFrame implements ActionListener
{
    
    public UpdateUITest()
    {
        super("Update UI Test");
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setSize(200,200);
        
        JButton button = new JButton("Change to windows LAF");
        button.addActionListener(this);
        
        getContentPane().setLayout(new GridLayout(2,1));
        getContentPane().add(button);
        getContentPane().add(new TestButtons());
    }
    
    public void actionPerformed(ActionEvent e)
    {
        try
        {
            UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
            SwingUtilities.updateComponentTreeUI(this);
        }
        catch(Exception ex)
        {}
    }
    
    public static void main(String[] args)
    {
        new UpdateUITest().setVisible(true);
    }
}

class TestButtons extends JPanel implements ActionListener
{
    private JFileChooser chooser;
    
    public TestButtons()
    {
        super();
        chooser = new JFileChooser();
        
        JButton button = new JButton("Open FIlechooser");
        button.addActionListener(this);
        add(button);
    }
    
    public void actionPerformed(ActionEvent e)
    {
        int returnVal = chooser.showDialog(this, "Select...");
    }
}

So although class TestButtons gets updated by UpdateUITest (it's a part of it's component tree I assume), my JFileChooser doesn't.

Do I need to override some method in TestButtons (perhaps override updateUI(), update the JFileChooser, then call super.updateUI())?
Or is there some other method I can use?
I could always create my own updateWithThisLAF() method, but doesn't seem the best way.

Regards,
Radish21